Filler rod for fusion welding



J. c'. ARMQR FILLER ROD FOR FUSION WELDING Filed Dec 6, 1922 March 31.1925.

WI TN E55 I IN VEN TOR.

4% ATTORNEYS.

Patented Mar. 31, 1925.

- UNITED STATES PATENT OFFICE.

FILLER 130D IEOR FUSION WELDING.

Application filed December 6, 1922. Serial No. 605,305.

To all whom it may concern.

Bev it known that I, JAMEs C. ARMoR, a citizen of the United States, andresiding in the borough of West View, in the county of Allegheny andState of Pennsylvania, have invented or discovered the new, useful, andImproved Filler Rod for Fusion Welding, of which the following is aspecification.

My invention consists in a new and improved filler rod for use inconnection with the same.

In joining meta-ls together by fusion welding,.it is evident that nogiven composition filler rod will produce equally good results with allmetals, or even when using the same metal for all classes of work.

Thus, in mild steel, great tensile strength may be required in one classof work, in

another great hardness; in another ductility and softness, etc. v

To obtain the various characteristics required, it is necessary to varythe compo-' sition of the metal or to use alloys.

However, it is'very diificult and very expensive to produce filler rodsof certain compositions of metals and certain'alloys, and in many casesthe filler rods, when heated, rapidly oxidized and deteriorate. Anotherdifliculty is that certain of the compositions and alloys melt at toolow temperatures and others form very large drops, thus preventin theformation of a perfect weld.

or these, and other reasons, it has been found impractical in the pastto use many compositions 'and alloys in fusion welding,

although such compositions and alloysare best fitted for the purposes inview.

To overcome these and other difliculties, I abandon the previouspractice of attempting to combine the elements in the form of acomposition'oralloy in the filler rod, but unite the elements at thepoint of fusion at the weld.

For convenience and to enable me to properly associate the elements inproper juxtaposition at the weld, I mechanically associate the elementstogether in the filler rod.

Thus in my improved filler rod, all of the elements of the desiredcomposition or alloy are mechanically associated together in the rod,but are not actually combined until they are melted and deposited in theweld.

/ Thus a'sa preferred form ofmy invention, I use a filler rod consistingof a'tube or cylinder of one metal-surrounding a core composed of theother metal or metals or an alloy of the same. Where a plurality ofmetals or elements are used I may form the outer tube or the core of twoor more elements which may be advantageously combined before beingapplied to the weld. I also prefer to mix or associate with the materialof the core, or if desired, with the material of the outer tube asuitable flux or fluxforming substance or substances, and also, whereadvantageous, suitable reducing and scavenging elements.

For instance, where nickel steel is required, I may make the outer tubeof steel, while the core contains the desired amount of nickel, eitheras a powder or in the form of a wire, the nickel belng in either casecombined or associated with a suitable fiux. Again if bronze berequired, the tube may be of copper and the core may contain tin andother desired elements together with a suitable flux. v

I may form the filler rod by using a wire of grooved or U-shaped crosssection composed of the metal or metals, which are to form the outertube, then introduce the element or elements, which are to form thecore, in the form of powder into the groove, the walls of the groovebeing then closed together to inclose the core.

Thus in Fig. 1 of the accompanying drawings, I show in perspective alength of said wire A into whose longitudinal groove'is introduced thecore material B, and the walls of the groove are then brought togetherto form a tube A in closing the core material B. Y

In Fig. 2 I show in persepctive, a filler rod composed of an outer tube-C composed of one or more of the elements, and having its axial boreoccupied by a wire D composed of the remaining elements.

It 's evident from the foregoing that my improved filler rod enables meto unite and combine the elements when melted in the weld, and thusavoid the difficulties above mentioned and which have attended theattempts to form a'filler rod of the elements in com osition or alloy.

I desired my filler rod may be used in the manufacture of desired alloysby merely melting the ,rod in a suitable crucible or mold. v

What I desire to claim is 1. A filler rod for use in fusion weldingconsisting of an outer inclosing wall formed of oneor more elements of acomposition metal or alloy, and a central core fOllIlGd of the remannngelement or elements togetherwlth a suitable flux.

2. A filler rod for usein fusion welding comprising an enclosed outerwell formed of one or more of the elements of a composition metal oralloy, and a central core, enclosed by said outer wall and comprising amixture of fiux and materials, in powdered form adapted to react with orbe added to the metal of the outer'wall after thesame has passed throughthe are.

De'c'r'nberf 1922.

3. A filler rod for use in fusion Welding consisting of an outer. sheathformed of one or more of the elements of the composition characteristic.

Signed atPittsburgh; a; this 2nd day (51:

JAMES of'ARMoR.

after passage through the .arc with the material-of the outer sheath'toform'an alloy of the desired 20

